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St. Catherine's, at the head of Lake Ontario, at the entrance of the Welland Canal, 12 miles from Niagara Falls, and on the Great Western Railroad, has a mineral spring, much frequented, which Dr. Chilton, of New York, analyzed and found to contain chlorides of calcium, magnesium, sodium, and iron, sulphate of lime, carbonates of lime and magnesia, bromide and iodide of magnesium, silica and alumina. Tuscarora Acid Spring is in the township of Tuscarora, about 20 miles north of Pass Dover. It contains a large amount of free sulphuric acid; beside sulphates of the alkalies, lime, magnesia, alumina and iron. Charlotteville Sulphur Spring is a few miles from Dover, on Lake Erie. It contains an unusual quantity of sulphuretted hydrogen. The Caledonia Springs-a well known watering place-are a few miles south of the Ottawa river, and 40 miles from Montreal. There are various sources; one-the Gas Spring-discharging carburetted hydrogen; a Saline and a Sulphur Spring; besides an Intermitting Spring, which discharges large quantities of carburetted hydrogen; and in which iodine and bromine have been detected.